03568cam a22003493u 4500 75074 UtSlPG 20260610134734.0 m cr n 260607r20251939utu|||||o|||||||||||||| d 39031782 UtSlPG en iso639-1 Z Gaines, Helen Fouché, 1888-1940 Elementary cryptanalysis Salt Lake City, UT : Project Gutenberg, 2025 1 online resource : multiple file formats text txt rdacontent computer c rdamedia online resource cr rdacarrier Release date is 2025-01-09 General information -- Concealment devices -- Transposition types -- Geometrical types: the Nihilist transposition -- Geometrical types: the turning grille -- Irregular types: columnar transposition -- General methods: multiple anagramming, etc. -- Substitution types -- Simple substitution: fundamentals -- The consonant-line short cut, a method for attacking difficult cases, by George C. Lamb -- Simple substitution with complexities -- Multiple-alphabet ciphers: the Vigenère -- The Gronsfeld, Porta, Beaufort ciphers -- The Kasiski method for periodic ciphers -- Miscellaneous phases of Vigenère decryptment -- Auto-encipherment -- Some periodic number-ciphers -- Periodic ciphers with mixed alphabets -- Polyalphabetical encipherment applied by groups -- Vigenère with key-progression -- Polygram substitution: the Playfair cipher -- Highlights of fractional substitution -- Investigating the unknown cipher -- Appendix: English frequency and sequence data; Comparative table of single-letter frequencies; Chart showing normal contact percentages, by F.R. Carter; Chart showing frequencies of English digrams, by O. Phelps Meaker; Some foreign language data; Bibliography, by W.D. Witt; The commonest English words, by Frank R. Fraprie; English trigrams, by Frank R. Fraprie; English digrams, by Frank R. Fraprie. "Elementary Cryptanalysis" by Helen Fouché Gaines is a scientific publication written in the late 1930s. This work serves as an instructional guide on the analysis and deciphering of various types of ciphers, primarily aimed at enthusiasts and students interested in cryptography. The book claims to fill a significant gap in English-language literature regarding cryptanalysis, providing readers with both theoretical knowledge and practical examples of how to solve cryptograms. The opening portion of the text introduces the definitions of key terms in cryptography, such as cryptography and cryptanalysis, while also highlighting the scarcity of accessible works on the latter topic for general readers. Gaines outlines the main types of ciphers, including concealment, transposition, and substitution, and emphasizes that her treatise focuses on basics rather than historical or literary aspects of ciphers. The preface sets up an educational framework to equip readers with the fundamentals they need to analyze and solve cryptograms, supported by a wealth of examples and exercises designed to test their skills. (This is an automatically generated summary.) Originally published: Boston: American Photographic Publishing Co., 1939 Cryptography Ciphers Lamb, George C. (George Chester), 1906-1939 https://openlibrary.org/works/OL7515752W/Cryptanalysis?edition=key%3A/books/OL7634764M https://www.gutenberg.org/ebooks/75074 115799 115799